I think the best solution goes something like this:
RumbleJay: "Honey, I loved the F10 so much. That's why I want you to have it. Enjoy it!"
Wife: "Thanks! That's awefully nice of you! You can have my car instead!"
RumbleJay: "Oh, that's great! In fact, I already traded in your car for my new M5/650i Gran Coupe........"
